Change criteria booleans to configurable threshold values.
Don't check IP 127.0.0.1.
Add auto-reporting of blocked user registrations as spammers.
Fix typo bug: cron scan of users didn't take action.
This is a complete rewrite of spambot.module. It is a functional superset of spambot.module 6.x-2.0 so regular users won't notice any changes, but the code underneath is different.